Filter



Nov. 27, 1945.

Fcil.

w. B. POND ET AL Filed Sept. lO 1943 FILTER IN1/EN T0125 Wil La/11B Pon d By Guildla Holi' A TTORNEY 2 Sheets-Sheet l Nov. 27, 1945. w. B, POND ET A1. ,2,389,314

FILTER Filed Sept. l0, 1943 2 SheetS---Sheei 2 su-u ` INI/NTORS. Will/aac 3. Pond Guild R. Holl'.

Patented Nov. 27, 1945 FILTER william n. rond, west Englewood, and Gund n. Holt, Hohokns, N. J., assignors to Bendix AviationCorporation, Teterboro, N. J., a corpora.-

. tion of Delaware Application September 10, 1943, Serial No. 501,862

' 2 claims. (o1. 1o- 164) This invention relates to iilter units and more Aparticularly to a device for separating out and removing matter suspended in a iluid.

An object of our invention is to provide a compact lter mounting in which a filter unit maybe conveniently installed. y

Another object of our invention is to provide novel means for observing the condition ofthe filter. v

Another object of our invention is to provide a novel valve means, whereby upon the coarser particles within a lter fluid impairing the passage of the iiuid through a filter the same may be by-passed through said valve until such time as the filter may be removed and cleaned.

Another object of` our invention is to provide a novel relief valve compactly mountedwithin the lter unit for permitting passage of a fluid medium when the lter has become clogged.

A further object of ou;` invention is to provide a compact iilter unit particularly adapted for use on airplanes in filtering anti-icing fluid or in filtering fiuid fuel for use in aircraft engines.

Another object of our invention is to provide a lter device which may be conveniently mounted in the cabin and arranged so that the pilot may readily observe the condition of the same.

A further object of our invention is to provide a compact filter unit of great efliciency in comparison to its size and of such simplicity in construction as to adapt it for manufacture andinstallation at low cost. j

The above and further objects and novel features of this invention will more fully appear from the following detailed vdescription and the accompanying drawings wherein like reference characters refer to like parts in the several views. It is to be expressly understood, however, that the drawings are for the purpose of illustration only and are not designed as a definition of the limits of the invention reference being had for this purpose to the appended claims.l

In the accompanying drawings ,which form a part of this specification like characters of reference indicate like parts in the several views wherein:

Figure 1 is a top plan view of one form of our invention. y

Figure 2 is an end view of Figure 1.

Figure 3`is an enlarged sectional view taken along the lines 3-3 of Figure 1 and looking in the direction of the arrows.

Figure 4 is a cross-sectional view taken along the lines 4-4 of Figure 3 and looking in the direction of the arrows.

Figure 5 is a cross-sectional view taken along the lines 5-5 of Figure 3 and looking in the direction of the arrows.

`Figure 6 is a cross-sectional view taken along Athe lines 6 6 of Figure `3 and looking in the direction of the arrows. f

In the form of the invention illustrated in Figure 1 there is provided, as shown in Figure 3, 'a casing I'I formed of a suitable clear plastic material. The casing II has formed therein alongitudinally extending channel I2 open at one side. The channel I2 has provided at opposite ends thereof suitable screw threaded channels I3 and Il. The channel I3 provides an inlet for a fluid medium to the channel I2, while the channel I 4 serves as an outlet for said fluid medium.

The longitudinally extending channel I2 may be closed at its open side by -a cap like member I5 having a longitudinally extending channel I5a formed therein. The cap I5 is arranged to t over the open side of the channel I2 and to enclose the same.

A tubular lter I6 formed of a suitable porous material of a type well known in the art is positionedlongitudinally Within the channel I2. The tubular filter I6 has positioned at the outlet end thereof a gasket II held in place by a plate I8. At the opposite end of the tubular iilter I6 is positioned a gasket I9 and a plate 20 held in place by a plate 2|. The plates I8 and 2| positioned at the opposite ends of the tubular lter I6 are secured in place by a bolt 22 engaging at one end theplate 2| and secured at the opposite end to the plate I8 by a nut 23.

A U-shaped strap 24 is further carried on the bolt 22 and has the arms 25 and 26 extending longitudinally within the tubular lter I6 and engaging at opposite ends the plates I8 and 2|. The sides of the U-shaped strap 24, as shown in Figure 4, support the tubular filter I6 against inwardly directed pressure. l

The casing Il has provided a slot 21 in which is positioned'one end of aleaf spring 28. A slot 29 corresponding to the slot 21 is provided in the cap I5 and is adapted to receive a flange 30 projecting from the casing I I together with the other end of the leaf spring 28. The leaf spring 28 bears at one end upon the flange 38 and at the opposite end in the slot 21 upon the casing Il. The leaf spring 28 further bears at a pointintermediate the opposite ends thereof upon the plate 2I`so as to bias the tubular lter I6 toward the outlet end thereof against a gasket 3| positioned within the channel I 2.

The leaf spring 28 has further provided a slot 32 for freely receiving a head portion 33 of the bolt. 22, as shown in Figure 6. The cap I also has provided a slot 34 for receiving a flange 35 projecting from the casing II. The flange 30 disposed within the slot 21, and the flange 35 'disposed within the slot 34, provide convenient means for positioning the cap I5 upon the casing Il. e

As shown in Figure 4, the tubular filter I6 rests upon flanges 36 and 36a, which project from the bottom of the channel I2 at the opposite ends thereof. An arcuate recess is formed in the flanges 36 and 36a for receiving a portion ofthe tubular filter I6.

Flanges 31 and 31a project inwardly from the vided the arm portions'sz and s: bent at points 54 and 65 and slidably-engaging at the free ends thereof the side surfaces of 4the projecting portions 5I. The points 54 and 55 of the leaf spring 49 are arranged to engage in notches 56 and 51, respectively, formed in the inner circumferential v surfaceof the fastening member 43 and thus cap I5 and are adapted to engage the tubular and 39 leading into the tubular filter I6. `The in- I6 is closed by the let end of the tubular filter arms and 26,

plate 20, which is fastened to the I6 at the opposite ends thereof so as to hold y and has formed therein an annular opening 40, slidably mounted closed by a valve member 40 -is biased on the bolt 22. The valve member into a valve closing 4I bearing at one end upon the plate 24 and at position by a helical spring the opposite end upon the valve member 40. The

plate I6 has formed therein suitable openings 42 leading from the interior of the tubular filter I6 into the outlet channel I4.

The cap I5 is fastened in ing II by suitable fastening members. and 43a which are arranged to engage, respectively, suitable cam surfaces 44 and 44a providedat opposite ends of the cap I5. y An annular opening is,

of the respective fastening provided on each place upon the casl members for receiving annular members 46 and 46a projecting from opposite ends of the casing I I and through which extend the inlet and outlet channels I3 and I4, respectively. The receiving f.

members 46 and 46a have provided a projecting lug 41 and 41a, respectivelyfor engaging the outer surface of the fastening members 43 and 43a so as to secure the same in place at the opposite ends of the casing II. Slots 48 and 48a are formed in the fastening members 43 and 43a, respectively, through which the lugs 41 and 41a may readily pass when positioning the fastening members 43 and 43a on the projecting portions 46 and 46a of the casing II. It will be readily seenthatiin assembling the cap I5 and adjustable fastening members 43 and 43a on the casing II, the operator or pilot first places the cap I5 in position and then places the fastening members 43 and 43a at opposite ends of thecasing II on theprojecting portion 46 and 46a, with the lugs 41 and 41a passing through the slots 48 and 48a, respectively. An adjustment orl twist of 180 degrees of the fastening member 43 and 43a by the operator will then cause the fastening members 43 and 43a to secure the cap I5 in place by engaging the cam surfaces 44 and 44a provided at the opposite ends thereof. Further the lugs 41 and 41a will likewise engage the outer surface of the fastening members 43 and 43a, as shown in Figures 2 and 3. In order to remove the ca'p I5 it is necessary for the operator to merely reverse the operation described.

There is further provided, as illustrated in Figure 5. a leaf spring 49 positioned in a slot 5I) formed in a projecting portion of the casing II indicated by the numeral 5I. A suitable pin or screw 50a is provided for securing the leaf spring 49 in the slot 5D. The leaf Spring 49 has prothose skilled secure the fastening member 43a in a locked relation under tension of spring 49. The fastening member 43 is constructed in like manner to member 43a. e

A gasket 68 is further positioned between the cap I5 and the casing II so that the same fits in sealing relation, as indicated in Figures 3, 4, 5 and 6.

In the operation of our novel filter device it will be seen fromfFigure 3 that upon a fluid medium under suitable pressure entering the filter device through an inlet channel I3 the said fluid medium will pass into the longitudinally extending channel I2. The said uid medium will then circulate through the porous wall of the tubular filter unit I6 into the interior thereof, through the openings 42, and out the outlet channel I4.

Itwill be further seen should the porous wall of the tubular filter unit I6 become clogged by dirt or-coarse"particles filtered from the fluid medium so as totherebyimpair the passage of fluid medium through the same, that the pressure of the fluid medium actingthroughthe openings 36 and 39 `will bias the valve member 4u so as to permit the direct entrance'of the fluid medium into the interior of the filter unit I6 Without passing through the filter wall I6. Thus the operation of `essential aircraft mechanism will not be impaired by the clogging of the filter I6. The openings 36 and 39 are formed of a size sufficient to prevent the passage of dangerously large particles of material through the filter device. Moreover since the casing II and top I5 are formed of a suitable clear plastic material, the interior of the ,filter device may be readily observed at all times. The filter u nit is arranged for mounting within the interior of the plane cabin so that upon the clogging of the filter and the by-passing of the fluid medium through the device by the action of the valve member 49, such action may be readily observed by the pilot.

Thus the lter unit I6 may be cleaned or replaced at the pilots convenience, without impairing the operation of essential aircraft mechanism during the period prio'r to the cleaning or replacement ofthe filter unit I6.

It will be further seen that upon removing the top .I5 the filter unit I6 may be conveniently removed for cleaning or replacement by removing leaf spring 28. This may be readily accomplished lby the pilot inserting the tip of the finger under as shown in Figure 6, is unattached to the tubu"v lar filter unit I6. Upon removing the leaf spring 28 the tubular filter unit I6 may be readily removed from the casing II by the fingers of the pilot.

Although only one embodiment of the invention has been illustrated and described, various changes in the form and relative arrangement of the parts, which will now appear to in the art, may be made without departing from the scope of the invention. Reference is, therefore, to be had to the appended claims for a definition of the limits of the invention.

What; is claimed is:

1. A filter device, comprising, in combination, a casing formed of a clear plastic material, a fluid medium inlet channel provided at one end of said casing, a uid medium outlet channel provided at the opposite end of said casing, a porous tubular filter unit positioned in said casing in longitudinal alignment with said inlet and outlet channels, said porous tubular filter unit open at one end to said outlet channel, a valve opening provided at the opposite end of said tubular lter unit for connecting said inlet and outlet channels through said tubular lter unit, a valve member mounted within said tubular lter unit and longitudinally movable in relation thereto, spring means provided within said tubular filter unit for normally biasing said valve member in such a manner as to close said valve opening to said inlet channel, a third channel formed within said casing and opening at one side of said casing, said third channel connected to said inlet channel, a leaf spring mounted in said third channel and biasing said tubular filter unit longitudinally toward said outlet channel in such a manner as to fasten said one end of said tubular filter unit at the inner end of said outlet channel, a removable cap member extending longitudinally on said casing for closing the open side of said third channel, fastening members mounted at opposite ends of said casing for securing said cap member in position, said fastening members rotatably adjustable for fastening and releasing said cap, andv said leaf spring having a turned over end portion whereby said leaf spring rnay be manually removed upon release cf said cap so as to enable the removal of said tubular lter unit from said cas ing.

2. A lter device, comprising, in combination, a casing, a main channel formed in said casing and extending longitudinally therein, said main channel opening at one side of said casing, a cap like member arranged to close the opening at said one side of said casing, uid inlet and outlet channels formed in said casing and opening at opposite longitudinal ends of said main channel, a porous tubular filter unit positioned in said main channel in longitudinal alignment with said inlet and outlet channels, resilient means biasing said tubular filter unit longitudinally toward one end of said main channel, fastening means for securing said cap like member in position, said fastening means adjustable so as to permit removal of said cap so as to open said main channel at said one side of said casing, whereupon removal of said tubular lter unit may be manually effected through the opening at said one side of said casing.

WILLIAM B. POND. GUILD R. HOLT. 

